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Quint gtatrs gaunt @ffi WILLIAM R FORD AND A. A. MOORE, OF CONCORD, NEW HAMPSHIRE,

Letters Patent No. 65,660, dated June 11, 1867.

IMPROVED COMPOSITION FOR PAVEMENTS.

TO ALL WHOM IT MAY CONCERN:

Be it known that we, WILLIAM P. FORD and A. A. MOORE, of Concord, in the county of Merrimac, and State of New Hampshire, have invented an Improved Composition for Pavements, &e.; and we do hereby declare that the following is a description of our invention sufficient to enable those skilled in the art to practise it. i i I i The invention relates to the manufacture of a composition to be used in the construction of walks, roadbeds, roofing, and for otlier weather-exposed surfaces; and the invention consists in combining resin with a mixture of coal tar, iron-foundry einders, and gravel, the resin serving to more firmly bind together the cinders and gravel, and to more perfectly indura-te the surface or bed made from the composition;

o are aware that compositions for road and walk-beds, or pavements, have been made up of coal tar, mineral paint, (or pulverized iron ore,) lime, and coal ashes or cinders, and also of coal tar, cinders, gravel, and coal ashes. But the surfaces made by such mixtures are found to be unreliable, because the coal tar retains its fluidity, and keeps the surface in a soft condition, and is constantly exuding from the surface by the influence of the heat and sun. Besides this, the disagreeable odor of the tar in its free condition is very objectionable.

To remedy these defects, we combine with the coal tar, eiuders, and gravel, resin, in such proportion that, while the requisite semi-fluidity or soft condition is imparted to the ingredients by the coal tar to enable them to be thoroughly incorporated and evenly laid upon the surface to be covered, the ingredients shall be perfectly cemented or bound together by the resin, while the resin at the same time ind urates and imparts a smoothness to the surface made by the composition, and gives to it a sufiicient elasticity to render it agreeable to walk upon or to ride over, and to prevent its cracking by expansion.

The proportions which we consider preferable to use, and the manner of inter-mixing, are substantially as follows: To twenty-five pounds of melted resin we add forty gallons of coal tar. Into a suitable tank, or in an excavation made in the ground, we put the gravel and einders, in the proportions of three-quarters gravel and one-quarter cinders, and pour over them the resin and tar mixture, (incorporated in the proportions above set forth,) until the excavation or tank is filled, or until the gravel and cinders are covered. Then we mix the whole well together spread the soft material over the walk or roadway to be covered, upon which a suitable gravel or sandy foundation has been prepared for it, and sift or spread evenly over the top of the bed thus made a thin layer of coal dust; after which the surface is well rolled down with a heavy roller.

We claim a composition for pavements, &c., 1nade up of the specific ingredients combined together substantially as set forth.

WILLIAM P. FORD,

A. A. MOORE.

Witnesses:

JOHN G. MUGRIDGE, L. S. MORRILL. 

